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sensored is a major + for crawling. very good combo for a descent price. i do have that esc with a 1800kv sensored motor. and no problems. it is not in my summit yet, but it is in a heavy e-maxx. so weight wise the combo handles it with ease on 4s. i wont go to full 6s yet.

would i need to shim the diffs or anything to run 4s? and how much speed would 4s give me on stock gearing?

Shimming diffs depends on whether they are sloppy or not. I mean if the pinion gear can move in and out of the diff a fair bit yes i would shim but if you can't move that pinion gear half a millimetre i don't think its worth a shim.
But i would certainly go over the truck and check the bearings etc for slop. Seriously don't under estimate brushless Lipo power.
I may be wrong and others will correct me if i am.

Speed wise. Now as you would know the "stock" summit isn't meant to be a speed machine. I estimate i have reached about 30kph or 18 mph, stock gearing, 5000mah 8.4v 7cell Nimh. So i would look over that speed, But not too much over until you change gearing.
Again i could be wrong as i don't have a brushless system but from reading a few brushless threads i don't think you get much more speed out of it on stock gearing.

okay well i ordered a dewalt from KD forever ago and it still hasnt come, so dad just bought me a 775 so i could run my summit, so your saying that in reality you wont be able to use all the power of a brushless system without breaking things?

That would be me,lol.what he says is true.It is very difficult to control the seductive charm of the gobs of instantaneous power that are just a little squeeze away.i have both systems but the dewalt is the one I use most.

i only plan to use 4s for now because i have 4 2s batteries and that gives me about an hour or so of trail and football field bashing, oh and towing my trailer with my cousins rusty on it through the bush